- A5
- B6
- C15
- D21
Step-by-Step Solution
Triangular numbers: tower 5 = 15, tower 6 = 21. Difference = 21 - 15 = 6 (you add the 6th counting number).
Answer: B) 6
Deepa builds towers of cubes. Tower 1 uses 1 cube, tower 2 uses 1 + 2 = 3 cubes, tower 3 uses 1 + 2 + 3 = 6 cubes (triangular numbers).
How many more cubes does tower 6 need compared with tower 5?
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